opentype

Documentation

Overview

Package opentype implements text layout and shaping for OpenType files.

Index

• type Collection
  • func ParseCollection(src []byte) (*Collection, error)
  • func ParseCollectionReaderAt(src io.ReaderAt) (*Collection, error)
  • func (c *Collection) Font(i int) (*Font, error)
  • func (c *Collection) Layout(ppem fixed.Int26_6, maxWidth int, txt io.Reader) ([]text.Line, error)
  • func (c *Collection) NumFonts() int
  • func (c *Collection) Shape(ppem fixed.Int26_6, str text.Layout) op.CallOp
• type Font
  • func Parse(src []byte) (*Font, error)
  • func (f *Font) Layout(ppem fixed.Int26_6, maxWidth int, txt io.Reader) ([]text.Line, error)
  • func (f *Font) Metrics(ppem fixed.Int26_6) font.Metrics
  • func (f *Font) Shape(ppem fixed.Int26_6, str text.Layout) op.CallOp

Types

type Collection

type Collection struct {
	// contains filtered or unexported fields
}

Collection is a collection of one or more fonts. When used as a text.Face, each rune will be assigned a glyph from the first font in the collection that supports it.

func ParseCollection

func ParseCollection(src []byte) (*Collection, error)

ParseCollection parses an SFNT font collection, such as TTC or OTC data, from a []byte data source.

If passed data for a single font, a TTF or OTF instead of a TTC or OTC, it will return a collection containing 1 font.

func ParseCollectionReaderAt

func ParseCollectionReaderAt(src io.ReaderAt) (*Collection, error)

ParseCollectionReaderAt parses an SFNT collection, such as TTC or OTC data, from an io.ReaderAt data source.

If passed data for a single font, a TTF or OTF instead of a TTC or OTC, it will return a collection containing 1 font.

func (*Collection) Font

func (c *Collection) Font(i int) (*Font, error)

Font returns the i'th font in the collection.

func (*Collection) Layout

func (c *Collection) Layout(
	ppem fixed.Int26_6, maxWidth int, txt io.Reader,
) ([]text.Line, error)

func (*Collection) NumFonts

func (c *Collection) NumFonts() int

NumFonts returns the number of fonts in the collection.

func (*Collection) Shape

func (c *Collection) Shape(ppem fixed.Int26_6, str text.Layout) op.CallOp

type Font

type Font struct {
	// contains filtered or unexported fields
}

Font implements text.Face. Its methods are safe to use concurrently.

func Parse

func Parse(src []byte) (*Font, error)

NewFont parses an SFNT font, such as TTF or OTF data, from a []byte data source.

func (*Font) Layout

func (f *Font) Layout(
	ppem fixed.Int26_6, maxWidth int, txt io.Reader,
) ([]text.Line, error)

func (*Font) Metrics

func (f *Font) Metrics(ppem fixed.Int26_6) font.Metrics

func (*Font) Shape

func (f *Font) Shape(ppem fixed.Int26_6, str text.Layout) op.CallOp